Track Characteristics
Like real disks, minidisks must be formatted for use by the appropriate
service program. A minidisk is initialized for use by executing one of
the following service programs in a virtual machine:
records.
disks except
disks, the
command
physical
to format specified tracks into
writes read-only track descriptor records for each track, and clears
the remaining portion of each track to binary zeros. It also writes
a format-5
of free space available for allocation). Any disk initialization
program that supports the operatinq systems use of the
type may be used if you are initializing full disks.
Minidisks defined in the
temporary minidisks
Alternate Tracks
automatically handled on the
Minidisks on the
automatically used by the
cylinder
automatically used by the
on alternate track usage. The
a data track and write the balance of the record in the space remaining.
In the case where an alternate track is required, the alternate track
can be assigned by IBCDASDI standalone using a dedicated
Cylinder
on the 3348 Data
cylinder containing the defective track, may be used for any purpose
whatever, including
There are only two restrictions:
on a defective track because then it will be impossible for the
the normal alternate track error recovery.